{
  "manageEntity": {
    "action": "Save",
    "entityId": "677846298",
    "entityType": "Track",
    "nonce": "0xb7e4eee0717b8309bf30b47b4f256e233a9e4e157bc123e06f9d9e83cf1c5a94",
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    "signer": "0x647204eDe2dcB8e40793BB48e4bb4Be7ab706de5",
    "userId": "580720856"
  }
}